/*******************************************************************************
 * Copyright (c) 2005, 2009 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * Contributors:
 * IBM Corporation - initial API and implementation
 *******************************************************************************/
package cn.elwy.rcp.ui.navigator.internal.resources.actions;

import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.core.runtime.Platform;
import org.eclipse.jface.action.IMenuManager;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.ISelectionChangedListener;
import org.eclipse.jface.viewers.ISelectionProvider;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.jface.window.IShellProvider;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.ui.IActionBars;
import org.eclipse.ui.IWorkbenchCommandConstants;
import org.eclipse.ui.actions.ActionContext;
import org.eclipse.ui.actions.ActionFactory;
import org.eclipse.ui.dialogs.PropertyDialogAction;
import org.eclipse.ui.navigator.CommonActionProvider;
import org.eclipse.ui.navigator.ICommonActionExtensionSite;
import org.eclipse.ui.navigator.ICommonMenuConstants;

/**
 * Adds the properties action to the menu.
 * 
 * @since 3.2
 */
public class PropertiesActionProvider extends CommonActionProvider {

  private PropertyDialogAction propertiesAction;
  private ISelectionProvider delegateSelectionProvider;

  public void init(final ICommonActionExtensionSite aSite) {

    delegateSelectionProvider = new DelegateSelectionProvider(aSite.getViewSite().getSelectionProvider());
    propertiesAction = new PropertyDialogAction(new IShellProvider() {
      public Shell getShell() {
        return aSite.getViewSite().getShell();
      }
    }, delegateSelectionProvider);
    propertiesAction.setActionDefinitionId(IWorkbenchCommandConstants.FILE_PROPERTIES);
  }

  /*
   * (non-Javadoc)
   * @see org.eclipse.ui.actions.ActionGroup#fillContextMenu(org.eclipse.jface.action.IMenuManager)
   */
  public void fillContextMenu(IMenuManager menu) {
    super.fillContextMenu(menu);

    if (propertiesAction.isApplicableForSelection()) {
      menu.appendToGroup(ICommonMenuConstants.GROUP_PROPERTIES, propertiesAction);
    }

  }

  /*
   * (non-Javadoc)
   * @see org.eclipse.ui.actions.ActionGroup#fillActionBars(org.eclipse.ui.IActionBars )
   */
  public void fillActionBars(IActionBars actionBars) {
    super.fillActionBars(actionBars);

    actionBars.setGlobalActionHandler(ActionFactory.PROPERTIES.getId(), propertiesAction);
  }

  /*
   * (non-Javadoc)
   * @see org.eclipse.ui.actions.ActionGroup#setContext(org.eclipse.ui.actions.ActionContext)
   */
  public void setContext(ActionContext context) {
    super.setContext(context);

    propertiesAction.selectionChanged(delegateSelectionProvider.getSelection());

  }

  private class DelegateIAdaptable implements IAdaptable {

    private Object delegate;

    private DelegateIAdaptable(Object o) {
      delegate = o;
    }

    /*
     * (non-Javadoc)
     * @see org.eclipse.core.runtime.IAdaptable#getAdapter(java.lang.Class)
     */
    @SuppressWarnings("rawtypes")
    public Object getAdapter(Class adapter) {
      if (adapter.isInstance(delegate) || delegate == null) {
        return delegate;
      }
      return Platform.getAdapterManager().getAdapter(delegate, adapter);
    }
  }

  private class DelegateSelectionProvider implements ISelectionProvider {

    private ISelectionProvider delegate;

    private DelegateSelectionProvider(ISelectionProvider s) {
      delegate = s;
    }

    /*
     * (non-Javadoc)
     * @see org.eclipse.jface.viewers.ISelectionProvider#addSelectionChangedListener(org.eclipse.jface.viewers.
     * ISelectionChangedListener)
     */
    public void addSelectionChangedListener(ISelectionChangedListener listener) {
      delegate.addSelectionChangedListener(listener);

    }

    /*
     * (non-Javadoc)
     * @see org.eclipse.jface.viewers.ISelectionProvider#getSelection()
     */
    public ISelection getSelection() {
      if (delegate.getSelection() instanceof IStructuredSelection) {
        IStructuredSelection sSel = (IStructuredSelection) delegate.getSelection();
        if (sSel.getFirstElement() instanceof IAdaptable) {
          return sSel;
        }

        return new StructuredSelection(new DelegateIAdaptable(sSel.getFirstElement()));
      }
      return delegate.getSelection();
    }

    /*
     * (non-Javadoc)
     * @see org.eclipse.jface.viewers.ISelectionProvider#removeSelectionChangedListener(org.eclipse.jface.viewers.
     * ISelectionChangedListener)
     */
    public void removeSelectionChangedListener(ISelectionChangedListener listener) {
      delegate.removeSelectionChangedListener(listener);

    }

    /*
     * (non-Javadoc)
     * @see org.eclipse.jface.viewers.ISelectionProvider#setSelection(org.eclipse.jface.viewers.ISelection)
     */
    public void setSelection(ISelection selection) {
      delegate.setSelection(selection);

    }

  }

}
